vmalloc: Extend for hugepages mapping

ascend inclusion
category: Feature
bugzilla: https://gitee.com/openeuler/kernel/issues/I4NDAW


CVE: NA

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Some devices could not handle mixed levels of page table. They want to
know exactly if the memory thay alloced is hugepages or not. Introduce
vmalloc/vmap/remap interfaces that handle only hugepages.

Introduce VM_HUGE_PAGES flag. __vmalloc_node_range() would alloc
PMD_SIZE hugepages only if specifying VM_HUGE_PAGES.

Signed-off-by: Wang Wensheng <wangwensheng4@huawei.com>
Signed-off-by: Tang Yizhou <tangyizhou@huawei.com>
Reviewed-by: Kefeng <Wang&lt;wangkefeng.wang@huawei.com>
Reviewed-by: Weilong Chen <chenweilong@huawei.com>
Signed-off-by: Zheng Zengkai <zhengzengkai@huawei.com>